Description

This Bulletin outlines the basic requirements for the construction of a drained and vented cavity that is suitable for use behind a range of exterior claddings with the exception of brick veneer and other wet cavity claddings.

Scope

This bulletin covers:

• drained and vented cavity construction including air pressure barriers, flexible wall underlay, rigid air barriers, flexible flashing tape, drainage and ventilation openings, cavity closure devices and cavity battens
• cavity maintenance, including ground clearance and cavity closure blockage.